#include<stdio.h>

int Sum(int s, int e)
{
	 int result = 0;
	 for(int i = s; i <= e; i++)
	 {
	 	result += i;
	 }
 	return result;
}

int main()
{
 	int start = 1;
 	int end = 100;
 	printf("I will begin\n");
 	int n = Sum(start, end);//[start,end]
 	printf("running done, result is: [%d-%d]=%d\n", start, end, n);
 	return 0;
}
